vintage glow plane

I am able to shim the servos, I already have the one for the throttle working properly. I'm not sure if I do need a new servo arm or if there's another way to fix the problem. The elevator and rudder work fine without the rods hooked up. I think it may need a little bit shorter of a control rod. The rod is adjustable but not very much. The control rod for the rudder is broken so I cant tell if that one will have the same problem. Thanks for the help!

Are the rods being bent down alot to attach the arm to the servo ( sometime a little oil on the rod will help ( if its moving through a tube ?  I have messed with RC before but been awhile < > If you put servo/radio  controls in neutral and adjust the rod to N and put it in the middle (as to have the same amount of travel both ways ) that should do it !?! Here ck this out i am not good at telling but i could show you   https://amaflightschool.org/getstarted/how-do-i-set-my-servos >>> Most threaded rod for this stuff can bee found online <<< https://www.google.com/search?q=control+rods+for+rc+planes&rlz=1C1SQJL_enUS817US817&oq=control+rods+for+RC+&aqs=chrome.1.69i57j0.16432j0j4&sourceid=chrome&ie=UTF-8